Components disappearing in website using SXA

In one of our website, the header and footer disappears after a while. And this is happening only for the home page. After we recycle the app pool or publish something then it starts showing up again. We are using SXA and upgraded it from 1.6 to 1.8

This website has two CDs. What we are envisioning is that, if it hits the site via one of the CD then it shows and if it hits the other then it disappears.

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